Teil 4 (letzte :D):
Post #117:
Yes, Red Line now has 0w40. They have a 0w30 too. The problem is still that at this time, the industry is not capable of formulating anything with a viscosity spread that high without VII's. NO company has been able to formulate a 0w30 or 0w40 without VII's because there is no basestock that has the ability to maintain viscosity like that. I think there may be some 0w20 formulations that have little to no VII's but we don't drive Hondas.
There is some decent info in that [Ferrarichat] article (and if you read through the thread, you'd see that the link has already been posted AS IN THE ABSOLUTE FIRST LINE OF THE FIRST POST IN THE THREAD), HOWEVER, the info is not complete. The only real information you can garner from that link is why you should try to run a lighter 'cold viscosity' oil. Reading that post could lead you to believe that running a 0w20 or 0w30/40 oil is the best idea ever, and it would be incorrect.
As I've mentioned, different engines stress motor oils differently. Some engines (notably Honda and Toyota's grocery-getters) put very little stress on the oil. The engines are designed with very good tolerances and you can potentially run a good oil out to 15,000 miles or more before changing it.
I don't care what oil you're using, I sure as heck wouldn't run ANY oil out to 15,000 miles in a VR4 unless you really only cruise on the highway, never get into boost, never rev the engine past 3500-4000rpm, make sure that there are absolutely no leaks in the intake tract, ensure that you have the absolute best air filter (NOT K&N), make sure that your rings are tight and you're getting minimal blowby, not running rich or getting fuel dilution, no leaks in the cooling system, etc. etc. etc..... and then I STILL wouldn't run the oil 15,000 miles.
I HAVE (with uoa) run Red Line 10w40 to 7500 miles before changing it out and the uoa indicated that I could potentially run it out longer, perhaps to even 10,000, but only if I didn't track the car. The wear metals were still low enough, and the TBN sufficient to run it further, but they were at the level where I wouldn't want to be pushing the car too hard for that added 2500 miles on that oil.
And as I've mentioned, Mobil1 0w40 sheared from less than 1000 miles of street driving (zero track time). I won't touch that stuff again with a ten-foot pole. Yet, it works quite well in some other platforms and engines and they can run it for 7000 - 12,000 miles.
Likewise, Royal Purple 10w40 sheared to a 30 weight in ~1200-1600 miles with ONE track trip) and yet, some folks LOVE that stuff in their cars.
See what I mean?
Most regular folks just go, "Eh... I don't know what I put in the car, whatever they sell me at Jiffy Lube". Even most enthusiast folks just go, "Yeah, I use XXX because I heard it's really good". So few folks bother to actually check to see if what's good in other engines is actually good in ours.
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Post #130:
Keep in mind that although zinc levels are important for most oils (phosphorus levels are simply as a carrier for zinc in the form of zinc dialkyldithiophosphate aka zddp) , some tribologists have been using molybdenum as a boundary lubricant.
Red Line uses it and so does Motul. In fact Motul has the highest moly levels I've ever seen in an oil available for street vehicles. If I didn't write about it in this thread, you can search my posts about moly's properties as a boundary lubricant and EP and FM additive.
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Post #138:
Even at 90+f ambient temps, Red Line or Motul 10w40 is a good viscosity. Bear in mind that esters are very resistant to heat and at high temps, a 40 weight ester base holds viscosity better than a 50 weight dino.
The only reasons to use a 50 weight ester are if you'll be running really hard at high temps (endurance racing at 90+f) or if you have very loose bearing clearances (In which case you really should replace the bearings).
BTW, 3k GT driver,
Regarding Mobil's blurb about synthetic base stocks, the whole motor oil community uproar about Mobil 1 was because they began using Grp III hydrocracked base stocks without changing their prices or marketing.
Castrol was the company that began doing that. Mobil filed with the board that governs advertising, claiming that Castrol was falsely advertising their oils as synthetic when they weren't truly synthetic. After considerations, it was deemed that hydrocracked oils were processed enough to allow the synthetic moniker and Castrol could continue to advertise their oils as full synthetic.
Since Grp iii cracked base stock is far cheaper than the PAO base Mobil had been using and the board had deemed it OK to call it synthetic, when Mobil had a PAO shortage, they began using Grp iii oils for the base stocks. Since their costs lowered dramatically, they kept at it,... while keeping their advertising AND pricing the same. More profit.
I don't know if they ever changed back to a full PAO base after the uproar, but i don't believe so. After all, it was only a relatively small section who heard about it compared to the clueless masses. Last time I looked, the temp specs still indicated the lower temp ranges indicative of Grp iii. PAO oils have very good low temp specs.
Doesn't matter to me ever since I saw how fast Mobil 1 0w40 sheared in my car from just street driving. Their stuff won't ever go in my car(s) again.
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Post #143:
There are other good oils of course, but if you get Red Line or 300V you won't have to worry/wonder about the oil. Just stay away from Mobil 1 0w40 (sheared in about 1000 miles of street driving ) and I would avoid Royal Purple 10w40 too, (sheared in about 1200 miles, with a couple hundred miles of track use).
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